SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b25da772a89ff3b4e8d86394c0c436188584b85b3803f343e85984f023c95e' 
  AND token = 'wahcGIVMoCi7DV7pyp6vowAjeYpbdrvjslJ/6igPDCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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