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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f8945e85f5b291e0ed4404679dfcb9176df579c20c51cae958ab93c75b698c3d' 
  AND token = 'vty9BJhnJC2zoxibGNmPPVvm1DLxP1Ha6vTA5ODrRmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00910

JSON explain

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