Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826bba07802eb8928e1bd185bc1e410e3eb5a252f00ef37cbc1543142cff85ae' 
  AND token = 'yV3UMyc+86xu+5YtYgvT9uI2upcMpR+0WoLNCcY8BPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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