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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f99af6714e5b8e5f41d8a82d866de2a7fed2d0287b3e7128cee458d0184c8f' 
  AND token = 'Tk8SqS5tK9iQNL+H5A2di4cbppOgPyufOlAFviUFFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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