Which MySQL users have access to a database?
You can append \G to the command to get results displayed in 'grid' veiw
SELECT * FROM mysql.db WHERE Db = '<database name in LC>'\G;
SELECT * FROM mysql.db WHERE Db = '<database name in LC>';
You might give this a try, should provide the best readability:
select db 'DATABASE', host HOST, user USER from mysql.db where db = '<databasename>';
Something more memorizeable for the cli:
select db,host,user from mysql.db;