Actually, you can have a look. Your card has a specific expiration date in the lower right corner. I cut a random picture on their website. You can have a look.

00/00, the month before, the year after, all on it. If the card expires, your card is in normal condition, and you haven't contacted the bank to apply for not changing it, CCB will mail you a new card in the month of expiration. And it will send you a message telling you the registered letter code. Watch yourself.