find out expired credit cards with MM/YY format

I have a table which stores expiry dates of credit cards

ExpiryDate Varchar(10) --datatype

The dates look like this:

'08/10'
'09/11'
'08/16'
'10/17'

how can i find out if a card's date is expired?

ANS: 

SELECT * from Table where isactive=1 
 AND LEFT(ExpiryDate
 
, 2) >= MONTH(GETDATE())
        AND RIGHT(ExpiryDate
 
, 2) >= RIGHT(YEAR(GETDATE()), 2)