Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c399d39a84f32b31a0e7da713bdb7157e3796b734eddf1b170cf8231c2199e4' 
  AND token = 'bizcecoIFCtwACzKP7cvqYs/ZDezEpUuQ5/o3DkNh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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