mysql - Like best performance in nested query -

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i have principal requet 2 requets in. have problem in second nested query, have condition on id , if made request id = 10 takes long time execute, if replace id 10 request execute in 1 second.

here request:

 select sql_no_cache contact_groupe.id_contact_groupe  toto.contact_groupe  left join toto.`contact` `contact`  on ((toto.contact_groupe.id_contact_groupe = toto.contact.id_contact_groupe))  left join toto.`project` `project`  on ((toto.contact_groupe.id_contact_groupe = toto.project.id_contact_groupe)  , ( toto.project.id_project  in (      select max(toto.project.id_project)         toto.project         ( toto.contact_groupe.id_contact_groupe = toto.project.id_contact_groupe ) ) )) left join toto.`phase` `phase` on ((project.id_phase = toto.phase.id_phase)) left join sql_base.`user` `user_suivi` on ((toto.contact_groupe.id_user_suivi = user_suivi.id_user)) ( en_attente = '0' , contact_groupe.id_contact_groupe in (      select distinct(contact_groupe.id_contact_groupe)      toto.contact_groupe      left join toto.`contact` `contact`      on ((toto.contact_groupe.id_contact_groupe = toto.contact.id_contact_groupe)      left join toto.`source_contact_groupe` `source_contact_groupe`      on ((toto.contact_groupe.id_contact_groupe = toto.source_contact_groupe.id_contact_groupe))      left join toto.`project` `project`      on ((toto.contact_groupe.id_contact_groupe = toto.project.id_contact_groupe))      left join toto.`remarque` `remarque`      on ((toto.contact_groupe.id_contact_groupe = toto.remarque.id_contact_groupe))      left join toto.`project_type_construction_options` `project_type_construction_options`      on ((project.id_project = toto.project_type_construction_options.id_project))      left join toto.`project_concurrent` `project_concurrent`      on ((project.id_project = toto.project_concurrent.id_project))      left join toto.`telephone` `telephone`      on ((contact.id_contact = toto.telephone.id_contact))      ( en_attente = '0' , ( toto.project.id_project = '10' )      , toto.contact_groupe.id_entreprise = '2' ) ) , toto.contact_groupe.id_entreprise = '2' ) order toto.contact_groupe.id_contact_groupe asc

the line following problem toto.project.id_project = '10' , don't understand why time execute request different between = , like

let's start subquery. 17 lines you've written functionally identical this, why not use instead?

select distinct g.id_contact_groupe              contact_groupe g            join project p              on p.id_contact_groupe = g.id_contact_groupe            g.en_attente = 0             , p.id_project = 10              , g.id_entreprise = 2

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