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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4da4196d1e199cde1d79d280688ba415ca1ccf10bcbc470b6af26f8f8ea6e32b' 
  AND token = 'u6uTV4mYaAgipSOw6w0kz3BcePiY089u/AbyM8Nd8kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00864

JSON explain

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