SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3538cdb4e57b482ec21d93907ae9fcd78bbd021af25cf67a8d8f540d2e586' 
  AND token = 'w/J+PzFoSkS37N18KQBdCwoUwkGbAt4kGkQ2J1krraM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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