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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b98e72a2beb517fff290c40d5a8f9b7726b4b9119f4f5f8d4dbbf1519fbe901b' 
  AND token = 'PRhztkVOl2D4eg24n0kG6b/MvQcj9PCgLMUJKOIgeOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01509

JSON explain

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