SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    16449, 8382, 8598, 16450, 10594, 7492, 
    7493, 7713, 7714, 10595, 7598, 14491, 
    17164, 17165
  )

Query time 0.00269

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": 14,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (16449,8382,8598,16450,10594,7492,7493,7713,7714,10595,7598,14491,17164,17165)"
    }
  }
}