Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d13d6faa04f1257945bd8e78447d4ea5bc8a75d8e04f1955f207a02dad5fe8' 
  AND token = 'Z6Hg7Gr7I53DH2rQJ8UONlJ/hpnwU7e8KlSWMFs6KZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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