Standard (Drinfeld-Jimbo) q-deformation of the Cartan-Weyl basis for o(3,2) (real form of B2) ⋍ sp (4R) (real form of C2) is calculated. The limit R --> ∞ (R is the anti-de Sitter radius) accompanied by a particular limit of the deformation parameter q(iR ln q --> const.) is performed. We obtain a modified Minkowski geometry with abelian translations but the four-momentum-dependent modification of the Lorentz boost algebra. The q-covariant generalization of the Klein-Gordon equation is given.