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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '99a6b5305ec4d6bc7a28e01092b2293df7b04e0255ed99fa53a186c906e7cbf8' 
  AND token = 'kybdEHDfhdhemKFeLU76GQTzWmv9oOjPHSazSmRg2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00797

JSON explain

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