SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89aadba6fd279bf734fc6d023ed408b8c4de1345984790e15ea7ac6343dd235b' 
  AND token = 'PrhFVPCzgUDNKN+KnlWdtGgeh4HvYZV+KQsKLC7fzsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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