Store regular MySQL query results in a timeseries DB
You can write a simple script, which would periodically execute SQL query and push its results to a TSDB via one of the supported data ingestion protocols. Various TSDBs support various data ingestion protocols: Influx line protocol, Graphite plaintext protocol, OpenTSDB telnet put protocol, JSON, CSV, etc. For example, all these protocols are supported by VictoriaMetrics - see these docs for details.