EDIT

The query created by the restriction performs not so bad (55ms):

select 
    this_.id as id1_499_2_, this_.created as created2_499_2_, this_.createdBy_id as created40_499_2_, this_.uuid as uuid3_499_2_, this_.updated as updated4_499_2_, this_.updatedBy_id as updated41_499_2_, this_.lsid_authority as lsid_aut5_499_2_, this_.lsid_lsid as lsid_lsi6_499_2_, this_.lsid_namespace as lsid_nam7_499_2_, this_.lsid_object as lsid_obj8_499_2_, this_.lsid_revision as lsid_rev9_499_2_, this_.protectedTitleCache as protect10_499_2_, this_.titleCache as titleCa11_499_2_, this_.acronym as acronym12_499_2_, this_.anamorphic as anamorp13_499_2_, this_.appendedPhrase as appende14_499_2_, this_.authorshipCache as authors15_499_2_, this_.basionymAuthorship_id as basiony42_499_2_, this_.binomHybrid as binomHy16_499_2_, this_.breed as breed17_499_2_, this_.combinationAuthorship_id as combina43_499_2_, this_.cultivarName as cultiva18_499_2_, this_.exBasionymAuthorship_id as exBasio44_499_2_, this_.exCombinationAuthorship_id as exCombi45_499_2_, this_.fullTitleCache as fullTit19_499_2_, this_.genusOrUninomial as genusOr20_499_2_, this_.homotypicalGroup_id as homotyp46_499_2_, this_.hybridFormula as hybridF21_499_2_, this_.inBasionymAuthorship_id as inBasio47_499_2_, this_.inCombinationAuthorship_id as inCombi48_499_2_, this_.infraGenericEpithet as infraGe22_499_2_, this_.infraSpecificEpithet as infraSp23_499_2_, this_.monomHybrid as monomHy24_499_2_, this_.nameApprobation as nameApp25_499_2_, this_.nameCache as nameCac26_499_2_, this_.nameType as nameTyp27_499_2_, this_.nomenclaturalMicroReference as nomencl28_499_2_, this_.nomenclaturalReference_id as nomencl49_499_2_, this_.nomenclaturalSource_id as nomencl50_499_2_, this_.originalPublicationYear as origina29_499_2_, this_.parsingProblem as parsing30_499_2_, this_.problemEnds as problem31_499_2_, this_.problemStarts as problem32_499_2_, this_.protectedAuthorshipCache as protect33_499_2_, this_.protectedFullTitleCache as protect34_499_2_, this_.protectedNameCache as protect35_499_2_, this_.publicationYear as publica36_499_2_, this_.rank_id as rank_id51_499_2_, this_.specificEpithet as specifi37_499_2_, this_.subGenusAuthorship as subGenu38_499_2_, this_.trinomHybrid as trinomH39_499_2_, rank2_.id as id2_99_0_, rank2_.created as created3_99_0_, rank2_.createdBy_id as created41_99_0_, rank2_.uuid as uuid4_99_0_, rank2_.updated as updated5_99_0_, rank2_.updatedBy_id as updated42_99_0_, rank2_.lsid_authority as lsid_aut6_99_0_, rank2_.lsid_lsid as lsid_lsi7_99_0_, rank2_.lsid_namespace as lsid_nam8_99_0_, rank2_.lsid_object as lsid_obj9_99_0_, rank2_.lsid_revision as lsid_re10_99_0_, rank2_.protectedTitleCache as protect11_99_0_, rank2_.titleCache as titleCa12_99_0_, rank2_.termType as termTyp13_99_0_, rank2_.uri as uri14_99_0_, rank2_.idInVocabulary as idInVoc15_99_0_, rank2_.kindOf_id as kindOf_43_99_0_, rank2_.partOf_id as partOf_44_99_0_, rank2_.symbol as symbol16_99_0_, rank2_.symbol2 as symbol17_99_0_, rank2_.vocabulary_id as vocabul45_99_0_, rank2_.orderIndex as orderIn20_99_0_, rank2_.rankClass as rankCla40_99_0_, representa3_.DefinedTermBase_id as DefinedT1_123_4_, representa4_.id as represen2_123_4_, representa4_.id as id1_423_1_, representa4_.created as created2_423_1_, representa4_.createdBy_id as createdB8_423_1_, representa4_.uuid as uuid3_423_1_, representa4_.updated as updated4_423_1_, representa4_.updatedBy_id as updatedB9_423_1_, representa4_.language_id as languag10_423_1_, representa4_.text as text5_423_1_, representa4_.abbreviatedLabel as abbrevia6_423_1_, representa4_.label as label7_423_1_ 
    from 
    TaxonName this_ 
    left outer join DefinedTermBase rank2_ on this_.rank_id=rank2_.id 
    left outer join DefinedTermBase_Representation representa3_ on rank2_.id=representa3_.DefinedTermBase_id 
    left outer join Representation representa4_ on representa3_.representations_id=representa4_.id 
    where this_.id in (
        select distinct this_.id as y0_ from TaxonName this_ left 
            outer join NameRelationship relationsf1_ on this_.id=relationsf1_.relatedFrom_id 
                where ((1=1 and (lower(this_.titleCache) like 'Geis%')) and ((not (relationsf1_.type_id=915) or relationsf1_.type_id is null)))
        ) 
    order by this_.titleCache asc limit 20

but the profiler reports ~5 seconds for this mysql query:

the most time is actually consumed by

Do we need to update the mysql driver for some reason?