That is the HS code for printed license keys for computer software. And the 40% is the ceiling rate, the general rate would be exempted (0 in practice)
Trading cards fall under HS code 4911.1090. Ceiling rate is also 40% but the reduced general rate is 10%.
Op will have to pay 10% import duty in the cards plus shipping plus insurance, and then 7% on the cards plus shipping plus insurance plus import duty.