SELECT 
  cscart_products.*, 
  cscart_product_descriptions.*, 
  MIN(
    IF(
      cscart_product_prices.percentage_discount = 0, 
      cscart_product_prices.price, 
      cscart_product_prices.price - (
        cscart_product_prices.price * cscart_product_prices.percentage_discount
      )/ 100
    )
  ) as price, 
  GROUP_CONCAT(
    CASE WHEN (
      cscart_products_categories.link_type = 'M'
    ) THEN CONCAT(
      cscart_products_categories.category_id, 
      'M'
    ) ELSE cscart_products_categories.category_id END 
    ORDER BY 
      cscart_categories.storefront_id IN (0, 1) DESC, 
      (
        cscart_products_categories.link_type = 'M'
      ) DESC, 
      cscart_products_categories.category_position ASC, 
      cscart_products_categories.category_id ASC
  ) as category_ids, 
  popularity.total as popularity, 
  company_descr.i18n_company as company_name, 
  cscart_products.is_returnable, 
  cscart_products.return_period, 
  cscart_product_sales.amount as sales_amount, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path, 
  cscart_discussion.type as discussion_type, 
  cscart_product_review_prepared_data.average_rating average_rating, 
  cscart_product_review_prepared_data.reviews_count product_reviews_count 
FROM 
  cscart_products 
  LEFT JOIN cscart_product_prices ON cscart_product_prices.product_id = cscart_products.product_id 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 0, 1) 
  LEFT JOIN cscart_product_descriptions ON cscart_product_descriptions.product_id = cscart_products.product_id 
  AND cscart_product_descriptions.lang_code = 'en' 
  LEFT JOIN cscart_company_descriptions as company_descr ON company_descr.company_id = cscart_products.company_id 
  AND company_descr.lang_code = 'en' 
  LEFT JOIN cscart_companies as companies ON companies.company_id = cscart_products.company_id 
  INNER JOIN cscart_products_categories ON cscart_products_categories.product_id = cscart_products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND (
    cscart_products.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_products.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_products.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_products.status IN ('A', 'H') 
  LEFT JOIN cscart_product_popularity as popularity ON popularity.product_id = cscart_products.product_id 
  LEFT JOIN cscart_product_sales ON cscart_product_sales.product_id = cscart_products.product_id 
  AND cscart_product_sales.category_id = 1716 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = 18567 
  AND cscart_seo_names.type = 'p' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
  LEFT JOIN cscart_discussion ON cscart_discussion.object_id = cscart_products.product_id 
  AND cscart_discussion.object_type = 'P' 
  LEFT JOIN cscart_product_review_prepared_data ON cscart_product_review_prepared_data.product_id = cscart_products.product_id 
  AND cscart_product_review_prepared_data.storefront_id = 0 
WHERE 
  cscart_products.product_id = 18567 
  AND (
    companies.status IN ('A') 
    OR cscart_products.company_id = 0
  ) 
GROUP BY 
  cscart_products.product_id

Query time 0.00239

JSON explain

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    "select_id": 1,
    "cost": 0.01927148,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
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          "key": "PRIMARY",
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          "used_key_parts": ["product_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "popularity",
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          "possible_keys": ["PRIMARY", "total"],
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        }
      },
      {
        "table": {
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          "possible_keys": ["PRIMARY", "pa"],
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          "rows": 1,
          "filtered": 100,
          "unique_row_not_found": true
        }
      },
      {
        "table": {
          "table_name": "cscart_products_categories",
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          "possible_keys": ["PRIMARY", "pt"],
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      },
      {
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          "key": "PRIMARY",
          "key_length": "3",
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          "attached_condition": "cscart_categories.storefront_id in (0,1) and (cscart_categories.usergroup_ids = '' or find_in_set(0,cscart_categories.usergroup_ids) or find_in_set(1,cscart_categories.usergroup_ids)) and cscart_categories.`status` in ('A','H')"
        }
      },
      {
        "block-nl-join": {
          "table": {
            "table_name": "cscart_product_prices",
            "access_type": "range",
            "possible_keys": [
              "usergroup",
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            ],
            "key": "usergroup",
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            "attached_condition": "cscart_product_prices.product_id = 18567 and cscart_product_prices.lower_limit = 1 and cscart_product_prices.usergroup_id in (0,0,1)"
          },
          "buffer_type": "flat",
          "buffer_size": "8KiB",
          "join_type": "BNL",
          "attached_condition": "trigcond(1) and trigcond(cscart_product_prices.product_id = 18567 and cscart_product_prices.lower_limit = 1 and cscart_product_prices.usergroup_id in (0,0,1))"
        }
      },
      {
        "table": {
          "table_name": "cscart_product_descriptions",
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          "possible_keys": ["PRIMARY", "product_id"],
          "key": "PRIMARY",
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          "attached_condition": "trigcond(cscart_product_descriptions.lang_code = 'en')"
        }
      },
      {
        "table": {
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          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
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          "used_key_parts": ["company_id", "lang_code"],
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          "attached_condition": "trigcond(company_descr.lang_code = 'en')"
        }
      },
      {
        "table": {
          "table_name": "companies",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
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          "attached_condition": "trigcond(companies.`status` = 'A')"
        }
      },
      {
        "table": {
          "table_name": "cscart_seo_names",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "dispatch"],
          "key": "PRIMARY",
          "key_length": "206",
          "used_key_parts": ["object_id", "type", "dispatch", "lang_code"],
          "ref": ["const", "const", "const", "const"],
          "loops": 1,
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          "cost": 0.00183779,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_seo_names.`type` = 'p' and cscart_seo_names.dispatch = '' and cscart_seo_names.lang_code = 'en')"
        }
      },
      {
        "table": {
          "table_name": "cscart_discussion",
          "access_type": "const",
          "possible_keys": ["object_id"],
          "key": "object_id",
          "key_length": "6",
          "used_key_parts": ["object_id", "object_type"],
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      },
      {
        "table": {
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          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
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          "used_key_parts": ["product_id", "storefront_id"],
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      }
    ]
  }
}