SELECT 
  cscart_product_sales.product_id, 
  amount AS sales_amount 
FROM 
  cscart_product_sales 
  LEFT JOIN cscart_products_categories ON cscart_products_categories.product_id = cscart_product_sales.product_id 
  AND cscart_products_categories.category_id = cscart_product_sales.category_id 
WHERE 
  cscart_product_sales.product_id IN (
    13445, 13446, 13447, 13448, 15166, 15732, 
    18508, 13504, 13449, 14651, 14140, 
    13450, 13946, 13916, 13963, 13919, 
    13929, 13932, 13895, 14020, 14656, 
    14654, 14661, 13899
  ) 
  AND cscart_products_categories.link_type = 'M'

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0307483,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_sales",
          "access_type": "index",
          "possible_keys": ["PRIMARY", "pa"],
          "key": "pa",
          "key_length": "6",
          "used_key_parts": ["product_id", "amount"],
          "loops": 1,
          "rows": 22,
          "cost": 0.00987299,
          "filtered": 100,
          "attached_condition": "cscart_product_sales.product_id in (13445,13446,13447,13448,15166,15732,18508,13504,13449,14651,14140,13450,13946,13916,13963,13919,13929,13932,13895,14020,14656,14654,14661,13899)",
          "using_index": true
        }
      },
      {
        "table": {
          "table_name": "cscart_products_categories",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "link_type", "pt"],
          "key": "link_type",
          "key_length": "9",
          "used_key_parts": ["link_type", "category_id", "product_id"],
          "ref": [
            "const",
            "u508912950_dev_2025.cscart_product_sales.category_id",
            "u508912950_dev_2025.cscart_product_sales.product_id"
          ],
          "loops": 22,
          "rows": 1,
          "cost": 0.02087531,
          "filtered": 100,
          "attached_condition": "cscart_products_categories.link_type = 'M'",
          "using_index": true
        }
      }
    ]
  }
}