SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c51576100170f92d17650d3498bde4379f2efe8b3c0c21c27d07690ef06e80' 
  AND token = 'WXW0xdrLsuzAUQS1QJ+/wg/t1VsP/gvD+Djw4yOEiqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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