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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2eb52e8dd3820481cd47f0655e6840fc4b20a0a90c785b53ed21a9175df6266c' 
  AND token = 'Ajd7kfiJYN3HAS3EDP5sFSn9W6VqFVMJP/2NP4h/UvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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