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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074de3f230639c3a1cd7f63df513f0bc1a7666e6f220ef60730457f9595c9f75' 
  AND token = 'xC2wWJ1lb0WM7yuPSjfQTQPP8cWTstLf1FwO72UGwN0=' 
  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"
    }
  }
}