Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6414ce29fdb3979198a340c0dd84be2140f2315b88498c21f1268e1cb9184fde' 
  AND token = 'gNoqlRcxfXjLEZb8owFSH1MmM29u+YX2jQ8fe+ZIPjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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