Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c422da7e868e148fd90c0616348991aa34831c9337cd92dc0224f193ca3857' 
  AND token = '4ZKMqAlDLrXfZ6tYPM/x5Oe8cAllzkbLBe8jsLKEFIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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