Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d05676fea5fe67cda19ddc5f2ad52460c6d426dffe83df9db9e7819b5cda928' 
  AND token = 'j7zXoO5k6jDzsGGRQu48PsaMB8AOq6dADFmuY7dmV3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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