SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    9947, 9953, 9952, 10074, 10096, 10075, 
    10602, 10087, 10130, 10603, 10135, 
    10134, 10139, 10138, 10137, 10141, 
    10143, 10142, 12628, 12627
  )

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (9947,9953,9952,10074,10096,10075,10602,10087,10130,10603,10135,10134,10139,10138,10137,10141,10143,10142,12628,12627)"
    }
  }
}