Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e96c5fb258a91426ea27deff4d66ab036e6713334da8159990293f4dd281553' 
  AND token = 'wilTnOkRKg5P4xEbvhZ1TKvQNNkwpwWW8OFajMK6JLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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