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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3a14f6b36c9dbba67d3b25dbae8ae55a19dfdfd528e723ea13267d76550e24e0' 
  AND token = 'lpgzMAjpumeQblOiCCl6U6mwTEa/5nNsYrd60qVS70s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00928

JSON explain

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