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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2efa222b527a1ae3ae8ba46e5d3b064ac3ff64c975ffdb5231aeb182524b7400' 
  AND token = '7J9jhrCTrTck1F4xq85EdvYWY4xVE8s4nS+WrbYOzuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00775

JSON explain

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