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SELECT 
  cscart_power_labels.label_id, 
  cscart_power_labels.status, 
  cscart_power_labels_description.label_name 
FROM 
  cscart_power_labels 
  LEFT JOIN cscart_power_labels_categories ON cscart_power_labels_categories.label_id = cscart_power_labels.label_id 
  LEFT JOIN cscart_power_labels_description ON cscart_power_labels_description.label_id = cscart_power_labels.label_id 
  AND cscart_power_labels_description.lang_code = 'en' 
WHERE 
  cscart_power_labels_categories.category_id = 7172

Query time 0.00033

JSON explain

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