SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    9727, 9728, 9729, 9730, 9731, 9732, 9733, 
    10181, 9734, 9735, 9724, 9803, 9805, 
    9797, 9800, 9799, 9798, 9801, 9802, 
    9806
  )

Query time 0.00041

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 (9727,9728,9729,9730,9731,9732,9733,10181,9734,9735,9724,9803,9805,9797,9800,9799,9798,9801,9802,9806)"
    }
  }
}