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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4440e5b6a848f25eb945e1f04bb911e1fcd5d975ecf7bca39fa81a6cdd25fc36' 
  AND token = 'iDVDewyKpq6AyuZRerFoAdOZGiCb9UQQTwQuqojEX3M=' 
  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"
    }
  }
}