Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50281b3e8ee8a9fcc55f9e0bc4b068afad239bb111fdcf658362b67234727f6d' 
  AND token = '22f0QBqdofML8TAOJ4ZUk0lcoF3EBT0kVfEEYllxpgI=' 
  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