Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d5871260b40faef8d7fefbfd4ef4540b2ac8da82bc6cbb5ab9c2e258c2c207' 
  AND token = 'lKdhEL2oESKH7OIoWSiT4LcYO/YkYhWySrzyEdhaIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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