Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4dcfa184584b45f008d58ced5c8c8a4bac70b16d4ee9f8a2946b73e1c71f67' 
  AND token = 'CvX/UGHklffeCa8lyTPUwPposyZRmbv1Fvx0b6j8+ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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