SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8523ad17f09b96569c819ac2048d15165fe3c127c7a4a7369cca07c2eced3350' 
  AND token = 'Z7UmfU+3oLeVngPgHM+js9of3o/QUVn+n57t9lT6RXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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