Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87298765e0b007e9de6e529026717597499cc6f12d938dfee8356f9e325be274' 
  AND token = 'k3UOXd9SpCnYtjhNu7nc0GJzKezVd3lMr1rWWQjvQJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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