MySQL View performance

I'm writing a PHP / MySQL application.
PHP 5.2 / MySQL 5.1
It's rather large and there are 34 MySQL tables.
I found that I had the same SQL statements with table joins being repeated in different parts of the application.
So I'm using views, which is good from a number of programing perspectives.
But my concern is performance it's not an issue at the moment because the database is relatively empty.
For example the attached view I run the following query.
SELECT *
FROM view_contact_assignedcontract
WHERE contactId=123

Which works fine with a test db of 100 records.
Does the SQL server need first create a temporary result set of all Contact records before it pulls out record #123 ?
Am I going to have performance issues as the database grows ?

CREATE OR REPLACE VIEW view_contact_assignedcontract AS
SELECT
-- Contact Info
  ct.ContactId AS contactId,
  CONCAT( ct.GivenNameEN,' ',ct.FamilyNameEN) AS contactNameEN,
  CONCAT( ct.FamilyNameZH,' ',ct.GivenNameZH) AS contactNameZH,
-- Company Info
  cp.CompanyId AS companyId,
  cp.CompanyNameEN AS companyNameEN,
  cp.CompanyNameZH AS companyNameZH,
-- Contract Info
  ctr.ContractId AS contractId,
  ctr.ContractName AS contractName,
  ctr.ContractNumber AS contractNumber,
  ctr.ContractCompleted AS contractCompleted
FROM contact ct
  LEFT JOIN company cp ON ct.Company_FK = cp.CompanyId
  LEFT JOIN contract ctr ON ct.AssignedContract = ctr.ContractId

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