SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09639df8bb68dd6efed0cfa040f722cb0b16ed4a04d8f9d7bcbea802c617d53' 
  AND token = 'alkd9/BbvC1m5jXS95u3div+987Aw7SXlWajPtibHpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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