Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce9fd6f4069fa7bf1f7c97db6c6b5cf3441b2d02fda810b59ad7748b495aac8' 
  AND token = '4KhApG39s7CpKuUoLnW3o9cSBBmFQ82a153XYMku5+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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