SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65806, 65807, 65809, 65810, 65811, 65812, 
    65817, 65818, 65819, 65820, 65821, 
    65822
  )

Query time 0.00060

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": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65806,65807,65809,65810,65811,65812,65817,65818,65819,65820,65821,65822)"
    }
  }
}

Result