Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5be89f64ebaa5202bde0d3ff554f88784074a124b705ad00601246ac6a680fd' 
  AND token = 'CXHsHa3ldiSnKwsWbXGWERjcCm1OntlUsROrMqgyfgE=' 
  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