SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    12995, 12996, 12997, 12998, 10713, 10714, 
    10715, 10716, 10717, 10718, 10719, 
    10720, 10721, 10722, 10723, 10305, 
    10306, 10307, 10308, 10309
  )

Query time 0.00071

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 (12995,12996,12997,12998,10713,10714,10715,10716,10717,10718,10719,10720,10721,10722,10723,10305,10306,10307,10308,10309)"
    }
  }
}