SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10329, 10356, 10376, 10309, 10330, 10357, 
    10377, 10310, 10331, 10358, 10378, 
    10311, 10332, 10359, 10379, 10312, 
    10333, 10360, 10380, 10334
  )

Query time 0.00089

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 (10329,10356,10376,10309,10330,10357,10377,10310,10331,10358,10378,10311,10332,10359,10379,10312,10333,10360,10380,10334)"
    }
  }
}