Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f357ccbbbdf1020e1e58f41da189e9c59a05e5020dbf307f6549d52b1d733f' 
  AND token = 'aEk9DYMLf7eDPb37PJ0SKfnbgFm9Q2wweiq8ImdfbOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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