Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e0b4b8e58d2efe84fd8daa954a87f5795497b4c34f17f52c23c80e83ae5ad1' 
  AND token = 'YZ4jeT6YTDXUZ7qaRhYFja0fE/udaSkv6nN8XvmvbEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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