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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'beb7bcd5f55e9b022326dfb066a9619f28d947ecf2eb85ddd9d6e2de24b26705' 
  AND token = '3KV49mPgqurSbvyINou8or3OEoXDr53Jgi0QUcjOe28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00780

JSON explain

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