SELECT 
  feature_id, 
  internal_name 
FROM 
  cscart_product_features_descriptions 
WHERE 
  feature_id IN ('') 
  AND lang_code = 'en'

Query time 0.00034

JSON explain

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