Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ecd5fb93c5ddd23b1517f0289a660e104d18623b7690d0dfe8d5abb56d4f02a7' 
  AND token = 'jFqsB1M2tGqtEKJUIm6jQAkiyd0xCdYuPIFLryF9Yww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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