SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed805e86020f0969729f8ad637dc3aa2977d4c2489d7ffef46683544c841956' 
  AND token = 'YP7rnhoFGecT7+C2riCDsnwV0ICOgswqvZrGXU5XHr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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