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SELECT 
  pf.feature_id 
FROM 
  cscart_product_variation_group_features AS gf 
  INNER JOIN cscart_product_filters AS pf ON gf.feature_id = pf.feature_id 
WHERE 
  pf.feature_id > 0 
  AND pf.filter_id IN ('V139') 
LIMIT 
  1

Query time 0.00095

JSON explain

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