SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10318, 10319, 10320, 10321, 10322, 10459, 
    10460, 10461, 10462, 10463, 10464, 
    10465, 10829, 10830, 10831, 10832
  )

Query time 0.00066

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": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10318,10319,10320,10321,10322,10459,10460,10461,10462,10463,10464,10465,10829,10830,10831,10832)"
    }
  }
}