SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '03bf0979ef3cf4bbdcd983bfb0e15723a76877ea71f0ba7c581799ba5ea8d635' 
  AND token = 'GphqkZewU1dNrF2dr1vYCNl+7gkqvkA+9luFSzjKO6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00774

JSON explain

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