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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2bde0a844cb0081d2ce7642b943374b3bda30ccb18a81611de6ad19aafb5f50d' 
  AND token = '2m6erKB9DQRwZ3MjMmhvdDrWwBEr4mkLKNW4TjhnXhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00816

JSON explain

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