SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fef2f676d3d124b68913c1eb3942f1237aed4ba7fe5042a8e28588d94eec6a0' 
  AND token = 'dlWgPfbufpYiftN22Gl7vFFfUC8gfhSj+XwyOBOCJ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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