Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c452462dffd8a1d9d10546f04d3f7b1321bfca3f87b9812a74208d0dec7ba5a' 
  AND token = 'BR/n+erkiKAu0QHxD8IiKqAyXCqz4YWhEMAHA1lGtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}