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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1d5a1edeace75cf9a0d23f87dae3b9e0c73cc41d83ea58caebb7010672722501' 
  AND token = 'AqeUwXR439CRYSc10i4lZOk3ZDZyBwYBJO6qymR/gd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00803

JSON explain

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