SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ce154b621f93bae1053b6445b2057193a300ef24580477918b886a88317b34' 
  AND token = 'ZcX6qq1YiKaoVWvqjzHVMWp/hUYcD9ZjlmQ2zZwQMzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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