MacBook Pro 13 (early 2015) with 4K Television: Can I get 60Hz?
The cable that you listed does not support 4K.  In fact, on the description page, it specifically states the following:


  Supports video resolutions up to up to 1920x1200 and 1080p (Full HD);
  easy-grip


If you are going to convert a signal from one to another (mDP to HDMI in this case) you need an active adapter like the Plugable Active Mini DisplayPort to HDMI 2.0 Adapter