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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c1a97a738ae915ca23472a729e8cb3e72496afc418db4f7a71a18559cd4433cc' 
  AND token = 'c01nZ9+wxi1eledWQyPpFIENZGtvzAxCj5vSZ8MTr00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00940

JSON explain

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