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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '671f4d6c6b6c928da6c0f95f7887eadc48151596d27bc7ba0131883601a9a30d' 
  AND token = '2Us5tx2/Myk4ovbHIDi2BE3ypjxX6OuUyFe91gnLFEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00753

JSON explain

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