SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '11cd2295c548a1b31f44c3b65fcf839920469ff1015da360d6378250815cba6d' 
  AND token = 'yLCYlGdgUDe2ZS+4iRHNkN2rXlBl97PrEKW7F/UqyT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01509

JSON explain

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