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SELECT 
  cscart_cp_power_rev_products.*, 
  cscart_cp_pow_attr_descr.cp_attr_name, 
  cscart_cp_power_ext_reviews.* 
FROM 
  cscart_cp_power_rev_products 
  LEFT JOIN cscart_cp_power_ext_reviews ON cscart_cp_power_ext_reviews.cp_attr_id = cscart_cp_power_rev_products.cp_attr_id 
  LEFT JOIN cscart_cp_pow_attr_descr ON cscart_cp_pow_attr_descr.cp_attr_id = cscart_cp_power_rev_products.cp_attr_id 
WHERE 
  cscart_cp_power_rev_products.product_id IN (21873) 
  AND cscart_cp_pow_attr_descr.lang_code = 'ru' 
  AND cscart_cp_power_ext_reviews.status = 'A' 
  AND cscart_cp_power_ext_reviews.company_id = 1 
ORDER BY 
  cscart_cp_power_rev_products.attr_pos

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}