Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ba257aee860be56480810e6bf12cfad9fc3f7be1d57a4aa9c9470b77a4bbce' 
  AND token = 'uJdS5hcUiHQ4qPWpR7dqmi5QGB1RMQNBN4FS8Dup5zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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