Q:

Identification of an unusual tree

Location : Lyon, France

I think it's one of the laziest trees I've ever seen XD

A:

As Sudachi has commented it has been pruned, probably over many years, to take on this form.  It is not natural shape. 
I would say that it is not possible to identify the exact species of tree without a close up of the leaves.  From zooming in it looks like it could be a Lawson Cypress (Chamaecyparis lawsoniana) although it could be a Leyland Cypress (x Cupressocyparis leylandii), or a number of other possibilities.   
One way to investigate this further if you want to know for certain, apart from posting a close up of the foliage which may help, would be to find some specimens of cypresses that you can find the name of.  Perhaps in a garden centre or an arboretum, then compare the smell of the foliage when you pinch and crush it between your fingers.  Different species have a characteristic smell that is a useful method for identification.