select
 group_concat(DISTINCT `ID` ORDER BY `ID`) AS `g_ID`,
 `ID_Ostanovki`,
 group_concat(DISTINCT `ID_Transporta` ORDER BY `ID_Transporta`) AS `g_ID_Transporta`
from `transport`
group by `ID_Ostanovki`
having `g_ID_Transporta` = "1,2"
order by `ID_Ostanovki`, `ID_Transporta`;

g_ID	| ID_Ostanovki	| g_ID_Transporta
--------+---------------+----------------
1,2	  1		  1,2
7,8	  4		  1,2

select t1.* from `transport` t1 left join
(
  select `ID_Ostanovki`,
    group_concat(DISTINCT `ID_Transporta` ORDER BY `ID_Transporta`) AS `g_ID_Transporta`
  from `transport`
  group by `ID_Ostanovki`
  having `g_ID_Transporta` = "1,2"
  order by `ID_Ostanovki`, `ID_Transporta`
) t2 USING (`ID_Ostanovki`)
where t2.`ID_Ostanovki` is not NULL;