Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0d8271649b1f9032ca770fccf22a7a5eeccb680affbba7033ef9f8c0e7c5ce' 
  AND token = 'WiuaYJYoxuAEuRp1v48oPC8p+aSFBt5gbHoVwonbUyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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