SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    5474, 5473, 248, 57, 205, 392, 59, 61, 
    62, 63, 65, 68, 69, 303, 73, 5556, 76, 
    380
  )

Query time 0.00050

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": 18,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (5474,5473,248,57,205,392,59,61,62,63,65,68,69,303,73,5556,76,380)"
    }
  }
}