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SELECT 
  ushop_state_descriptions.state 
FROM 
  ushop_states 
  LEFT JOIN ushop_state_descriptions ON ushop_state_descriptions.state_id = ushop_states.state_id 
  AND ushop_state_descriptions.lang_code = 'es' 
WHERE 
  ushop_states.country_code = 'US' 
  AND ushop_states.code = 'RN'

Query time 0.00145

JSON explain

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