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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9f99197eb2a6b6ae5160d62f9bebbe4bd5f840b8feed9c86843661bed3704b4e' 
  AND token = '5Hv7limtTFAX8yIfb4XlAgxzYaFNMAQzzaaDsimvmfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00776

JSON explain

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