Mudei o DBAPI para MySQL-Connector e usei o seguinte código:
ssl_args = {'ssl_ca': ca_path}
engine = create_engine("mysql+mysqlconnector://<user>:<pass>@<addr>/<schema>",
connect_args=ssl_args)
E agora funciona.
ssl_args = {'ssl_ca': ca_path}
engine = create_engine("mysql+mysqlconnector://<user>:<pass>@<addr>/<schema>",
connect_args=ssl_args)
