Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdb5a954837122fd8535d610d2869cf908b818710f99c9aad569b85fe9e3d2a' 
  AND token = '8iyIE9iOkwFxJS0LRX8juocvMt4QutO8MjjchPCFbBw=' 
  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"
    }
  }
}