Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660c93ebe6e5bd3a3d7a3f5968152a9a5bc062413dac66f453e3dbcea53d0499' 
  AND token = 'l3qiQPD8ZyAhK8tS+XKVMDbUFKtsI6Xujo/bwT/NPBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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