SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10353, 10373, 10325, 10352, 10372, 10324, 
    10351, 10371, 10323, 10350, 10370, 
    10349, 10348, 10347, 10346, 10345, 
    10343, 12985, 12986, 12987
  )

Query time 0.00049

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 (10353,10373,10325,10352,10372,10324,10351,10371,10323,10350,10370,10349,10348,10347,10346,10345,10343,12985,12986,12987)"
    }
  }
}