SELECT 
  cscart_product_files.*, 
  cscart_product_file_descriptions.file_name, 
  cscart_product_file_descriptions.license, 
  cscart_product_file_descriptions.readme 
FROM 
  cscart_product_files 
  LEFT JOIN cscart_product_file_descriptions ON cscart_product_file_descriptions.file_id = cscart_product_files.file_id 
  AND cscart_product_file_descriptions.lang_code = 'en' 
WHERE 
  1 = 1 
  AND cscart_product_files.product_id = 2213 
  AND preview_path != '' 
  AND cscart_product_files.status = 'A' 
ORDER BY 
  cscart_product_files.position asc, 
  cscart_product_file_descriptions.file_name asc

Query time 0.00070

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_files ref product_id product_id 3 const 1 Using where; Using temporary; Using filesort
1 SIMPLE cscart_product_file_descriptions eq_ref PRIMARY PRIMARY 9 toolboxdigitalshop_dev.cscart_product_files.file_id,const 1 Using where

Result

file_id product_id file_path preview_path file_size preview_size agreement max_downloads total_downloads activation_type position status folder_id file_name license readme
2171 2213 DSR013_LEE_JEFFRIES_JUSTIN_BOURNE_-_DROP_THE_DIME_-_LT1_RIGGSYs_DEATHSTAR_RMX.mp3 DSR013_LEE_JEFFRIES_JUSTIN_BOURNE_-_DROP_THE_DIME_-_LT1_RIGGSYs_DEATHSTAR_RMX_SAMPLE.mp3 16049460 1440578 N 5 0 P 0 A DSR013: Lee Jeffries & Justin Bourne - Drop The Dime (LT1 & Riggsy's Deathstar Mix) (Deathstar Recordings)