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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85348d85ea74fb72ccc2a9b971454a299c956219982649b3cf5b5b476334e3f' 
  AND token = 'wfGnSyUeMW2irz1g7ZV4/u7adZ9VCVKpGMnOhW/ot74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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