SELECT 
  page_id, 
  location_id, 
  currency_code 
FROM 
  vi_yl_vipiris_page_settings 
WHERE 
  page_id = 20

Query time 0.00008

JSON explain

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