SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids 
FROM 
  cscart_products_categories 
  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_categories.status IN ('A', 'H') 
WHERE 
  cscart_products_categories.product_id IN (
    13883, 13884, 13885, 13886, 13887, 13888, 
    13906, 13907, 13917, 13918, 13926, 
    13927, 13933, 13934, 13935, 13936, 
    13937, 13941, 13942, 13998, 13999, 
    14000, 14001, 14002, 14003, 14004, 
    14005, 14006, 14007, 14008, 14009, 
    14010
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.085975997,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products_categories",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "pt"],
          "key": "pt",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 32,
          "cost": 0.03357848,
          "filtered": 100,
          "attached_condition": "cscart_products_categories.product_id in (13883,13884,13885,13886,13887,13888,13906,13907,13917,13918,13926,13927,13933,13934,13935,13936,13937,13941,13942,13998,13999,14000,14001,14002,14003,14004,14005,14006,14007,14008,14009,14010)",
          "using_index": true
        }
      },
      {
        "table": {
          "table_name": "cscart_categories",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["category_id"],
          "ref": ["u508912950_dev_2025.cscart_products_categories.category_id"],
          "loops": 32,
          "rows": 1,
          "cost": 0.03189888,
          "filtered": 100,
          "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')"
        }
      }
    ]
  }
}