SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10271, 10272, 10273, 12573, 12571, 12575, 
    12572, 10300, 10317, 10322, 10299, 
    10304, 10316, 10321, 10295, 10298, 
    10303, 10315, 10320, 12554
  )

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 (10271,10272,10273,12573,12571,12575,12572,10300,10317,10322,10299,10304,10316,10321,10295,10298,10303,10315,10320,12554)"
    }
  }
}