SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cfc4d8edc41b50c0118f796c81cf81bfd3990063c3c1b613ad74f77acbcc40' 
  AND token = 'vuCd9sjkOQ93AfwQt9vDUKQjzL9I/wrpzvuE4XhLBII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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