SELECT 
  MIN(point_price) 
FROM 
  cscart_product_point_prices 
WHERE 
  product_id = 277987 
  AND lower_limit = 1 
  AND usergroup_id IN (0, 0, 1)

Query time 0.00046

JSON explain

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

Result

MIN(point_price)