Your scope has a 40mm objective lens but that's not the outside diameter of the objective bell. Measure the OD of the objective bell.
Talley says their low rimfire rings are .350" to the bottom of the scope tube and their high rings are .600".
For those uncomfortable with the math, with the difference in height between the receiver and barrel on the CZ 457 factored in, the low rings are sufficient for an objective bell OD of 1.7". The high rings will be good for an OD of 2.2". These figures are for a one inch scope tube.