SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10782, 10783, 10784, 10785, 10786, 10787, 
    10788, 10789, 10790, 10791, 9688, 10792, 
    10793, 10794, 10795, 10796, 10797, 
    10798, 10799, 10800
  )

Query time 0.00088

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 (10782,10783,10784,10785,10786,10787,10788,10789,10790,10791,9688,10792,10793,10794,10795,10796,10797,10798,10799,10800)"
    }
  }
}