SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c7b6cfe5f37586f1f4928cc22f9d64e9ac740ff4c72d7952ab3821137778e3' 
  AND token = 'EqBKL5qI8JhJ3RzMFl7jY9oRqFnIJqYRPeCslwNEb6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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