SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f63fc4f2b3852da14dbe0afe0122a8ecd3c70886bafe4524d706d1c785eb130' 
  AND token = '8Bn/4FU/YY4VihAw+D1S+05MHRZBAKX/gAjbZMYrS94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

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