SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10aacb757e4e0095dbecf484c07a50cb6c6c554d177a5fdde47421b26157935' 
  AND token = 'ywE+xfTDON51LKc/uuJGtJhuzFWDqzhf7+MwwUyVDcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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