根據網上資料，最終解決：
下載MySQL_python-1.2.5-cp27-none-win_amd64.whl（https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysql-python，然後pip install xxxx.whl安裝即可）

D:\01 software\Python相關軟件>pip install MySQL_python-1.2.5-cp27-none-win_amd64.whl
You are using pip version 7.1.0, however version 9.0.1 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip‘ command.
Processing d:\01 software\python????\mysql_python-1.2.5-cp27-none-win_amd64.whl
Installing collected packages: MySQL-python
Successfully installed MySQL-python-1.2.5

D:\01 software\Python相關軟件>python
Python 2.7.10 (default, May 23 2015, 09:44:00) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
>>> exit
Use exit() or Ctrl-Z plus Return to exit
>>> ^Z
 

Windows10-python2.7安裝MySQLdb報錯