Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc23a4b1d8bf09751bf1eefafb77572515634afe561b173662970bbeafda084' 
  AND token = 'oejtyUOe8KQn9XszyP3tNtuJWMrM6dwGRF9SsU7Bdms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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