Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d80bade1e99aea1c3367b830d292c9265f352b0ae06dc8c3d2f79a71c580160' 
  AND token = 'lqkgl063sDoeobdxKflh8AOO+eClKK61PyIk+EPQaZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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