SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e827c131be74d23994c4bad406eaace11d929fe08eef06f57d8b1fb3f73b28ae' 
  AND token = '1ZY7gVeR+GzFFY+XYH2MiZykrEzj/49HCof4OpWl5h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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