Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb3194e3ce83427f89e07af4790161d0a0fbd6b5df452ad3e8612dd556fb653' 
  AND token = 'tAkV9yBhtvbcE4HRdxrLp/5j3dhtR7VYDOA4Rump3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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