SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9be82b0aa60728bac71e0004e8d7c647f4622e5e72cfdb15380386e357fa7ed' 
  AND token = 'G8WsxVxODdhodt7yuHdxfvo3deSDgpoiLf+mujanD2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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