MySQL查询可用的日期和时间段

I am needing to access two tables from the existing database: ea_user_settings and ea_appointments

The data in those tables looks like this:

ea_user_settings
id_users_provider   working_plan
85                  {"sunday":null,"monday":null,"tuesday":{"start":"11:00","end":"19:00","breaks":[{"start":"16:00","end":"17:00"},{"start":"13:00","end":"14:00"}]},"wednesday":null,"thursday":null,"friday":null,"saturday":null}

The breaks variable ranges from [] to as many as the privider schedules.

ea_appointments
id  start_datetime              end_datetime               id_users_provider
1   '2015-09-08 14:00:00:00'   '2015-09-08 14:50:00:00'    85
2   '2015-09-08 15:00:00:00'   '2015-09-08 15:50:00:00'    85
3   '2015-09-17 12:00:00:00'   '2015-09-17 15:50:00:00'    89
4   '2015-09-17 16:00:00:00'   '2015-09-17 16:30:00:00'    89
5   '2015-09-22 11:00:00:00'   '2015-09-08 11:50:00:00'    85
6   '2015-09-22 12:00:00:00'   '2015-09-08 12:50:00:00'    85
7   '2015-09-22 14:00:00:00'   '2015-09-08 14:50:00:00'    85
8   '2015-09-22 15:00:00:00'   '2015-09-08 15:50:00:00'    85
9   '2015-09-22 17:00:00:00'   '2015-09-08 17:50:00:00'    85
10  '2015-09-22 18:00:00:00'   '2015-09-08 18:50:00:00'    85

I need a MySQL query that will yield the following: For provider 85 between 2015-09-07 and 2015-09-23 how many available 60 min slots exist. Result would look like this:

id_users_provider    available_days   available_slots
85                   2015-09-08       4
85                   2015-09-15       6

I see this Mysql Find free time (slots) between appointments for booking system and other similar posts. This helps me see how I can extract availability between existing appointments. I also see that I would need to join that with a table expressing the providers working plan. I am not sure how to extract the working plan into a table to join and produce the result. So, any tips will be appreciated.