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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ba975950e00a5e241ad96dca9720ea0257aae0558bf70d2ef15b5462fa62d6b1' 
  AND token = 'gfxbxfwOfoQO160qHZDP+Awg1eQNmqUwIvE74/+X8zU=' 
  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"
    }
  }
}