Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1621d0cbb4651d823110b7bd20b3a990d10a903dbeecc883ee6156f9730e8ff8' 
  AND token = 'LYvclmn7TXrPUQ4nzAEk14BLIq2vv3MRYLFUHkh6NoI=' 
  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"
    }
  }
}