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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1724afa764fccd230eb713c0383ffc6478963e184107a6d8ae15e67aa063a1c4' 
  AND token = 'WzqfQtooQKxikZ3WWBx/DdyCwam7WzmlmX1qrLmu3LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00852

JSON explain

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