SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bdc094df88c80a63e5771a164d681648d713996b9d508b787ee671bfa78182' 
  AND token = 'vrjpNktBCLfGtmQG+J+rno26LpjVHpwIPKRkduCsnco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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