Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4919c497857900f0eb0f2f7bf8e0209237e90f0312797da95e6b283ff778ffd3' 
  AND token = 'qFFD8QNEOrzoVeYsWrAWgy37mnW3ak/N25IFBWUpFMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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