Sandbox

SELECT 
  q_state_descriptions.state 
FROM 
  q_states 
  LEFT JOIN q_state_descriptions ON q_state_descriptions.state_id = q_states.state_id 
  AND q_state_descriptions.lang_code = 'en' 
WHERE 
  q_states.country_code = 'AE' 
  AND q_states.code = ''

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}