Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe42f1f3eec8df90c736a277d3835f090310eeabfd8906b03444fe4ab1abf201' 
  AND token = 'KIZKnR5cn3Zki5sTUJWTOIhLofwPYOfNq3rRD2TsGpg=' 
  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