SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bbb5d935cd7c32138f3efffa1120034e280eb3bc7affc4740886679412a14889' 
  AND token = '4HXDdAjMHXb2FRlnAdXZPWMzOmg9C7+SLZEFxGV+png=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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