Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4850cc1b9e8f3eb63aeefc8417d9043daf50799d58781b407e9743fadfb00fca' 
  AND token = 'c/3Qf706FBwRu280keUXOn24CV1vqp4fnLk1YfpuM0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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