Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6718b2630145aec82c706be94e2d88c11857750b7ad575677ee0221bcea861' 
  AND token = 'JE3C6n70JZRbvjudBjZzZc5Ni2OMu95zYolUflwhvzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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