SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10330, 10331, 10332, 10333, 10334, 10335, 
    10336, 10337, 10338, 10339, 10340, 
    10341, 10342, 10778, 10779, 10780, 
    10781, 10782, 10783, 10784
  )

Query time 0.00087

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 (10330,10331,10332,10333,10334,10335,10336,10337,10338,10339,10340,10341,10342,10778,10779,10780,10781,10782,10783,10784)"
    }
  }
}