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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9fcd464d2ebf8178698d2491368b6cda9f699771d61cfeda3de8d481dceda9' 
  AND token = 'xC09Dzd5Tb+7imNoSrtvhOly3xwVKUXo6QiI7ccKHJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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