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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '588f451c689efe9805e891fc21833d81a7380d3d2082d3e5b76512ed35393d6e' 
  AND token = 'dYyJZsUvoVHRU69i2wOzzOy545KWEetn6P20IZH7Xic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00810

JSON explain

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