Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9f40cc4c4adfe68bd7d2952873f583a97ca2b0c3d279bd19698158e168d7fb' 
  AND token = 'KqPXJMr2MOS2o6KmysRMR9IwFPIeDWWWXciFLt/oaes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables