What is the ruling on chewing qat and missing the Asr prayer at its appointed time with the congregation, then praying it half an hour before Maghrib?

Chewing qat is forbidden (haram) because it is an intoxicant and distracts one from the remembrance of Allah and from prayer. It leads to delaying prayers past their prescribed times and neglecting congregational prayers. All of these are prohibitions that make chewing qat strictly forbidden.